{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.83,"date":"2043-09-24","moon_free_dark_hours":1.68,"moon_illumination":60,"moon_separation":104.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.88,"date":"2043-09-25","moon_free_dark_hours":2.72,"moon_illumination":48,"moon_separation":90.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.93,"date":"2043-09-26","moon_free_dark_hours":3.9,"moon_illumination":37,"moon_separation":77.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.98,"date":"2043-09-27","moon_free_dark_hours":5.15,"moon_illumination":27,"moon_separation":63.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.03,"date":"2043-09-28","moon_free_dark_hours":6.38,"moon_illumination":18,"moon_separation":50.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.08,"date":"2043-09-29","moon_free_dark_hours":7.6,"moon_illumination":10,"moon_separation":36.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.13,"date":"2043-09-30","moon_free_dark_hours":8.77,"moon_illumination":5,"moon_separation":24.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.17,"date":"2043-10-01","moon_free_dark_hours":9.17,"moon_illumination":2,"moon_separation":12.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.22,"date":"2043-10-02","moon_free_dark_hours":9.22,"moon_illumination":0,"moon_separation":5.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.27,"date":"2043-10-03","moon_free_dark_hours":9.25,"moon_illumination":1,"moon_separation":15.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.32,"date":"2043-10-04","moon_free_dark_hours":9.3,"moon_illumination":3,"moon_separation":26.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.36,"date":"2043-10-05","moon_free_dark_hours":9.35,"moon_illumination":7,"moon_separation":38.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.41,"date":"2043-10-06","moon_free_dark_hours":9.38,"moon_illumination":13,"moon_separation":50.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.46,"date":"2043-10-07","moon_free_dark_hours":9.25,"moon_illumination":20,"moon_separation":62.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.5,"date":"2043-10-08","moon_free_dark_hours":8.63,"moon_illumination":28,"moon_separation":74.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.55,"date":"2043-10-09","moon_free_dark_hours":7.85,"moon_illumination":37,"moon_separation":85.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.59,"date":"2043-10-10","moon_free_dark_hours":6.95,"moon_illumination":46,"moon_separation":97.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.64,"date":"2043-10-11","moon_free_dark_hours":5.92,"moon_illumination":56,"moon_separation":110.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.68,"date":"2043-10-12","moon_free_dark_hours":4.8,"moon_illumination":66,"moon_separation":122.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.73,"date":"2043-10-13","moon_free_dark_hours":3.63,"moon_illumination":75,"moon_separation":135.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.77,"date":"2043-10-14","moon_free_dark_hours":2.45,"moon_illumination":84,"moon_separation":148.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.82,"date":"2043-10-15","moon_free_dark_hours":1.27,"moon_illumination":91,"moon_separation":161.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.86,"date":"2043-10-16","moon_free_dark_hours":0.05,"moon_illumination":96,"moon_separation":173.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.9,"date":"2043-10-17","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":167.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.94,"date":"2043-10-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":153.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.99,"date":"2043-10-19","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":138.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.03,"date":"2043-10-20","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":123.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"11:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.07,"date":"2043-10-21","moon_free_dark_hours":0.3,"moon_illumination":84,"moon_separation":109.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.11,"date":"2043-10-22","moon_free_dark_hours":1.3,"moon_illumination":74,"moon_separation":94.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.15,"date":"2043-10-23","moon_free_dark_hours":2.45,"moon_illumination":63,"moon_separation":80.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.1,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Fri"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2043-09-24","target":{"dec":2.05238823,"morphology":"E3","name":"3C 273","ra":187.27791594,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=3C%20273","source":"sesame","type":"BLL","type_text":"BL Lac object \u2014 a blazar","vmag":14.83}}